As installed on our VEX-SS Varmint Rifles, this scope riser clamps to any Picatinny Rail, and raises scope height by 1/2 inch. Its two piece design will not mar camo finishes, yet clamps onto the rail firmly with its separate side clamp and two allen head screws (included). The two allen screw heads recess into the riser so they can’t snag on clothing or webbing. 1 1/4” long; machined of aircraft aluminum with black anodize finish. Two required to mount most scopes. Made in the USA.